DLDay B. Ligon

Day B. Ligon

*This is an algorithmically generated author record based on publicly available information.

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Previous Organizations / Institutes

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Day B. Ligon has a total of 15 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    AI-Assisted Transcription of Handwritten and Audio Data in Fisheries

    by Jonathan M. Fisk, Sam Chaney, Hae Kim, Day B. Ligon, Todd B. Parnell, Quinton E. Phelps

    Natural resource agencies routinely collect handwritten and audio field data that must be transcribed before analysis, creating a persistent bottleneck in data management. Recent advances in artificial intelligence (AI) may help automate portions of this work, yet their utility in routine fisheries applications remains largely untested. We evaluated commercially available AI-assisted workflows against standard manual transcription. The evaluation considered total processing time and initial transcription accuracy. Across the AI pilot datasets, initial accuracy averaged 97% for handwritten records and 95% for audio recordings. After quality control, the AI-assisted workflows reduced total processing time by approximately 37% for handwritten transcription and 49% for audio transcription. The larger operational datasets produced reductions of approximately 30% and 57%, respectively. Initial accuracy for the larger handwritten dataset declined to 82.3%, but all identified errors were corrected during quality control. These findings show that commercially available AI can improve a time-intensive aspect of natural resource data management without specialized programming or custom software. Incorporating AI-assisted transcription into existing workflows can reduce administrative workload and move field observations into management and research applications sooner.

  • The Spring–Summer Nesting and Activity Patterns of the Western Chicken Turtle (Deirochelys reticularia miaria)

    by Donald T. McKnight, Joshua R. Harmon, Jennifer L. McKnight, Day B. Ligon

    The Eastern and Florida Chicken Turtle subspecies (Deirochelys reticularia reticularia and D. r. chrysea) exhibit nesting cycles that are atypical for aquatic North American turtles, with nesting occurring in the fall, winter, and early spring. The reproductive cycles of the western subspecies (D. r. miaria), however, have not been studied. Therefore, we monitored the reproductive status of female D. r. miaria in 2012 and 2013. In our populations, both male and female D. r. miaria were inactive on land from mid-July to mid-March. This differs from the activity patterns of the other subspecies in which females typically remain active into the fall and sometimes winter. Also, in contrast to the nesting patterns of D. r. reticularia and D. r. chrysea, female D. r. miaria developed follicles in the spring and summer (March–July) and contained eggs in the summer (May–July). Therefore, we conclude that the Western Chicken Turtle exhibits a nesting pattern that is more similar to that of other sympatric species in the family Emydidae than it is to other subspecies of D. reticularia.


  • Activity Patterns of Ornate Box Turtles (Terrapene ornata) in Northwestern Illinois

    by Charles R. Tucker, Jeramie T. Strickland, Brian S. Edmond, David K. Delaney, Day B. Ligon

    Activity patterns of ectothermic animals are affected by weather, time of day, and season, but quantifying these effects can be logistically challenging. We used an automated radio telemetry system to quantify Ornate Box Turtle (Terrapene ornata) activity patterns for two years in northern Illinois. Continuously collected activity data were paired with meteorological data collected from the site to determine factors influencing turtle behavior. Temperature, relative humidity, rain, year, month, time of day, and reproductive status affected activity levels. Increased activity levels corresponded with rain events, and males were generally more active than females, especially during spring and late summer. Overall, turtles were less active during an uncharacteristically warm and dry year compared to a year with conditions that were closer to the long-term average. Bimodal daily activity patterns have been reported in more southerly populations, and we found similar patterns near the species’ northern range l...


  • Open Access

    Interspecific Variation in Temperature Effects on Embryonic Metabolism and Development in Turtles

    by Day B. Ligon, Matthew B. Lovern

    We measured temperature-induced differences in metabolic rates and growth by embryos of three turtle species,Macrochelys temminckii, Trachemys scripta, andApalone spinifera, at different, constant, temperatures. Oxygen consumption rate (VO2) was measured during development and used to characterize changes in metabolism and calculate total O2consumption. Results from eggs incubated at different temperatures were used to calculate Q10s at different stages of development and to look for evidence of metabolic compensation. Total O2consumption over the course of incubation was lowest at high incubation temperatures, and late-term metabolic rate Q10s were Apalone spiniferahatchling mass was unaffected by temperature, whereasT. scriptamass was greatest at high temperatures andM. temminckiimass was lowest at high temperatures. Hatchling mass : length relationships tended to correlate negatively with temperature in all three species. Although we cannot reject positive metabolic compensation as a contributor to the observed VO2patterns, there is precedence for drawing the more parsimonious conclusion that differences in yolk-free size alone produced the observed incubation temperature differences without energetic canalization by temperature acclimation during incubation.


  • Acute and Persistent Effects of Pre‐ and Posthatching Thermal Environments on Growth and Metabolism in the Red‐Eared Slider Turtle, Trachemys scripta elegans

    by Day B. Ligon, Charles C. Peterson, Matthew B. Lovern

    Many ectotherms possess the capacity to survive a wide range of thermal conditions. Long‐term exposure to temperature can induce acclimational and/or organizational effects, and the developmental stage at which temperature exposure occurs may affect the type, degree, and persistence of these effects. We incubated red‐eared slider turtle embryos at three different constant temperatures (Tinc; 26.5, 28.5, 30.5°C), then divided the resulting hatchlings between two water temperatures (Twater; 25, 30°C). We calculated growth rates to assess the short‐ and long‐term effects of thermal experience on this metabolically costly process. We also measured resting metabolic rate (RMR) at three body temperatures (Tbody; 26.5, 28.5, 30.5°C) shortly after hatching and 6 months posthatching to characterize the degree and persistence of acclimation to Tinc and Twater. Hatchling RMRs were affected by Tbody and Tinc, and fit a pattern consistent with positive but incomplete metabolic compensation to Tinc. Average growth rates over the first 11 weeks posthatching were strongly affected by Twater but only marginally influenced by Tinc, and only at Twater = 30°C. Six‐month RMRs exhibited strong acclimation to Twater consistent with positive metabolic compensation. However, within each Twater treatment, RMR fit patterns indicative of inverse metabolic compensation to Tinc, opposite of the pattern observed in hatchlings. Average growth rates calculated over 6 months continued to show a strong effect of Twater, and the previously weak effect of Tinc observed within the 30°C Twater treatment became more pronounced. Our results suggest that metabolic compensation was reversible regardless of the life stage during which exposure occurred, and therefore is more appropriately considered acclimational than organizational. J. Exp. Zool. 317:227–235, 2012.